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The BrightVolt Take: Your Hot-Water Tank Is the Cheapest Battery

The BrightVolt Take: Your Hot-Water Tank Is the Cheapest Battery

Nov 5, 2026 | Home Electrification, Renewable Energy

For a home with a heat pump, the cheapest storage on the property is the hot-water tank, not the battery — and Tesla has just conceded as much. Its new Heat Pump Optimisation lets a Powerwall 3 tell the heat pump to overheat its tank on spare solar: 300 litres lifted...